An unopened bottle of vodka and two empty paper LCBO bags were found inside the vehicle of a Pembroke dentist on trial for drunk driving, according to an Ontario Provincial Police collision investigator.

OPP Const. Shawn Kelly, a collision investigator, testified in court Thursday during the high-profile trial of Pembroke dentist Dr. Christy Natsis. (CBC)

A BlackBerry was also found up behind the gas pedal, so far up it couldn't be reached during the search performed days after the crash, said OPP Const. Shawn Kelly.

His testimony continued Thursday during Dr. Christy Natsis's trial.

Natsis is facing charges of impaired driving causing death, dangerous driving causing death and exceeding the legal blood-alcohol limit in the March 2011 crash on Highway 17 that killed 50-year-old Bryan Casey.

Earlier testimony from Kelly indicated Casey's white truck was driving in the eastbound lane, while the black Ford Natsis drove was going west.

Kelly spent five hours, measuring, photographing and lazering the highway accident scene that night and on Thursday, he testified about tremendous forces causing gouges on the eastbound lane of the highway at the crash scene.

When vehicles collide in a head-on fashion, the impact can force the undercarraige down causing such gouges or cuts in the pavement, Kelly said.

Crash wasn't completely head-on

Kelly testified that the crash wasn't 100 per cent head-on. Instead, the driver sides collided, sending both vehicles into a rotation after the initial impact. Natsis's heavier Ford pushed Casey's lighter truck backward in a southwest direction.

Dr. Christy Natsis is charged with impaired driving causing death, dangerous driving causing death and exceeding the legal blood-alcohol limit. (CBC)

Kelly said both vehicles were relatively clean inside, and that he didn't see any junk on the floor that could have contributed to the crash. He also said Natsis's Ford had no mechanical defects.

During his testimony, Kelly made a brief reference to a phone call he had with Natsis on April 14, 2011.

Defence lawyer Michael Edelson said he wasn't ever told about that phone call, and asked Ontario Superior Court Justice Neil Kozloff for a five-minute break to discuss the phone call with Natsis.

When court reconvened, Kelly was asked to describe the details of the phone call.

He testified it was about five or six minutes long, and that he told Natsis her vehicle had been released and she could pick up her things, including a pair of shoes.

He said Natsis told him she was looking for her wallet and ID, and he said he didn't see them. She asked if the vehicle was secure, and he said yes.